/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.jelly.tags.junit;

import java.io.File;

import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.XMLOutput;

/**
 * Checks that a file exists, and if not, then the test will fail.
 */
public class AssertFileExistsTag extends AssertTagSupport
{
	/** The file to check */
	private File file;

	/**
	 * Do the tag functionality: check the file exists.
	 * @param output a place to write text output
	 * @throws JellyTagException if the file doesn't exist.
	 */
	@Override
    public void doTag(final XMLOutput output) throws JellyTagException
    {
        String message = getBodyText();
        if (message == null || message.length() == 0)
        {
            message = "File does not exist.";
        }


        if (file == null)
        {
            throw new MissingAttributeException("file");
        }
        assertTrue(message, file.exists());
	}

    /**
     * The file to be tested. If this file exists, the test will pass.
     * @param aFile the file to test.
     */
    public void setFile(final File aFile)
    {
        file = aFile;
    }
}
